| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 173 |
78.6%
|
| 2 | Within past 3 months | 14 |
6.4%
|
| 3 | Within 6 months | 5 |
2.3%
|
| 4 | More than 6 months ago | 28 |
12.7%
|
| Sysmiss | 12260 |